Sydney woman acquitted over husband's fatal stabbing

Sydney woman Marcela Castaneda has been found not guilty of murder or manslaughter after she fatally stabbed of her abusive husband following a fight about their wedding.

Ms Castaneda was originally charged with murdering Gregory Peck at their western Sydney home on February 22, 2013, but last week the jury was directed to find her not guilty of that charge due to a lack of evidence.

Today after about five hours of deliberations the six-man and six-woman jury at the Supreme Court also acquitted the 33-year-old of his manslaughter.

Relieved family supporting her in court gasped as the verdict came down.

Ms Castaneda fatally stabbed Mr Peck at their home the night she told him she wanted to cancel their wedding and asked him to move out.

Shaking and fighting back tears, Ms Castaneda previously told her trial that after she tried to end the four-and-a-half-year relationship she felt Mr Peck's hands around her neck "all of a sudden".

"I could feel pressure around my neck and I was struggling to breathe - I couldn't scream," she told the Supreme Court.